Pedestrian hit by a car

My uncle got hit by a car while he was crossing road he's on tourist visa. Police clear the person who did the accident. My uncle is in critical condition both legs fractured and now hospital is asking for their surgery cost 160000 sr , how will pay this money and for their medical expenses. Insurance company isn't responding on it. My uncle is in hospital from 4 days without having medical services. Please help me on that.